TypeError: "x" has no properties

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Message

TypeError: Unable to get property {x} of undefined or null reference (Edge)
TypeError: null has no properties (Firefox)
TypeError: undefined has no properties (Firefox)

Error type

TypeError.

What went wrong?

Both, null and undefined, have no properties you could access.

Examples

null.foo;
// TypeError: null has no properties

undefined.bar;
// TypeError: undefined has no properties

See also